A printhead is provided for an inkjet printer. The microfluidic dye laser also includes an elastomer substantially optically transparent at the pump light wavelength and at a microfluidic dye laser wavelength. Each safety cover includes a cover plate and a collar operatively associated with and extending downwardly from the cover plate for mounting to an upper end of a reinforcement bar. Elastic preload elements are provided which are able to exert a preload torque to clamp the guide tooth of each braking disc circumferentially against one of either the upstream or downstream faces of the guide groove. The inventive toilet bars have excellent mush and wear properties. The post-treatment is selected from the group consisting essentially of ultra-violet curing, laser curing, e-Beam curing, and combinations thereof.